XlPHOCEPHALUS ARMATUS. 119 



1. XiphocephalllS armatns, H. MILNK EDWARDS, 1840. 

 PI. VI, fig. 120; and p. 20, fig. 2; p. 34, fig. 57, and p. 40 fig. 80. 



Diagn. The head, without the rostrum, is longer than the first six 

 personal segments together. The neck is a little longer 

 than the ocular region. The rostrum is much longer than 

 the perseon and pleon together. 



The flagellum of the first pair of antennae in the male is 

 four-jointed. 



The seventh perceonal segment is about as long as the sixth, 

 the hind corner is broadly rounded, not produced downwards. 



The epimeral of the first pair of perceopoda is tongue-shaped. 

 The carpal process of the first pair has a single sharp tooth on 

 the hind margin; the lower hind corner of the metacarpus is 

 sharp-pointed. The femur of the fifth and sixth pairs is dilated- 



The first ural segment is much shorter than the last coalesced. 



The first pair of uropoda are shorter than the third; the se- 

 cond pair are shorter than the last coalesced ural segment. 

 The outer ramus of the first pair is nearly half as long as 

 the inner; the outer ramus of the second pair is scarcely 

 a fourth part as long as the inner ; the outer ramus of the third 

 pair is diminutive, much shorter than a tenth part of the inner. 



The telson is longer than the pleon and urus together. 



COLOUR. White, almost hyaline, with red spots on the last joints of the legs 

 and on the uropoda, the eyes are deep red, almost black. 



LENGTH. 50120 mm. 



HAB. The tropical region of the Atlantic, the Indian Ocean the 



Pacific. 



Syn. 1840. Oxycephalusarmatus, H.MILNE ED WARDS. 7, p. 101. 



Rhabdosoma armatum, A. ADAMS and A. WHITE. 1848. 9,p. 63, pi. 



13, fig. 1. 



SPENCE BATE. 1862. 20, p. 334, pi. 



54, fig. 6. 



TH. STREETS. 1878. 26, p. 288, pi. 



2, fig. 7. 



(e. p.) C. GLAUS. 1879. 27, p. 194(51). 



1887. 36, p. 74, pi. 



26, fig. 1-4. 



Rhabdonectes armatus, C. BOVALLIUS. 1887. 35, p. 39. 



1858. Macrocephalus longirostris, SPENCE BATE. 18, p. 362. 



